Notorious child murderer and pedophile Robert Black, whose reign of terror across the U.K. in the 1980s drove fear into the hearts of parents all over the country, has died of natural causes in Maghaberry prison, Northern Ireland, according to BBC News.

Black had been serving 12 life sentences for the murders of four young schoolgirls in the 1980s. While he most probably had other victims, he was convicted for the murders of 9-year-old Jennifer Cardy, 10-year-old Sarah Harper, 11-year-old Susan Maxwell and 5-year-old Caroline Hogg.

After terrorizing the U.K. for years, his reign of terror finally ended in 1990 when authorities were able to apprehend him in the Scottish village of Stow. He was arrested in his vehicle with a 6-year-old girl hooded, bound, gagged and stuffed in a sleeping bag at the back of his van, reported The Yorkshire Evening Post.

The young girl retrieved from his van was found to have been sexually assaulted moments before her rescue.

Black was ultimately convicted for his offences, with multiple life sentences being given to him from 1990 to 2012. His last conviction, which was given in 2012, was for the murder of his first known victim, Jennifer Cardy.

"The Prison Service has confirmed that a 68-year-old prisoner has died at Maghaberry Prison. While this is not being treated as suspicious, the Prison Service has informed the PSNI, Coroner, and Prisoner Ombudsman. It would not be appropriate to comment further at this time," an NI Prison Service spokeswoman said, according to Chronicle Live.

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